Fix memory corruption observed with PHP 5.6.0-dev
redis.c:7022:13: warning: 'keyword' may be used uninitialized in this function (mostly to make gcc happy)
Fix: library.c:743:78: warning: unused variable 'p2' (PLEASE CHECK)
Fix ibrary.c:1541:9: warning: unused variable 'sz' + 'val8'
Fix warning: 'klen' may be used uninitialized in this function